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On Monday 06 December 2004 15:44, Michael Kay wrote: > In the context of streaming, most of the techniques > described are not very different from those used in the > better XSLT processors. One big difference is that XSLT > 1.0 is typically implemented using a dual push/pull > model: XSLT instructions use a push pipeline to write a > tree, while XPath expressions use a pull streaming model > to read data from trees; whereas this paper describes a > model that uses pull iterators uniformly. Interesting you picked up this point from that paper. In the context of the area I have been working in we have traditionally had two implementations of XPath, one push and one pull. These have now been unified into a single implementation that can operate either as pull or push. For implementation reasons the push does not look much like a simple SAX filter approach but its a push never the less. The rational for merging the two was partly functional needs and partly the difficulty of supporting XPath2 over two separate implementations. Kev.
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